Peptococcaceae Rogosa 1971 (Approved Lists 1980) emend. Lv et al. 2020 Peptococcus Kluyver and van Niel 1936 (Approved Lists 1980) emend. Shkoporov et al. 2016 Universal Root Woese et al. 1990 Bacteria (None 2015) Woese et al. 1990 Firmicutes (sic) Gibbons and Murray 2021 Bacillota corrig. Gibbons and Murray 2021 Firmacutes (sic) Gibbons and Murray 2021 Clostridia Rainey 2010 Eubacteriales Buchanan 1917 (Approved Lists 1980) emend. Tindall 2019 Peptococcaceae Rogosa 1971 (Approved Lists 1980) emend. Lv et al. 2020 Eubacteriales Buchanan 1917 (Approved Lists 1980) emend. Tindall 2019 Eubacteriaceae Ludwig et al. 2010 Caldicoprobacteraceae Yokoyama et al. 2010 Christensenellaceae Morotomi et al. 2012 Clostridiaceae Pribram 1933 (Approved Lists 1980) emend. Spring 2021 Defluviitaleaceae Jabari et al. 2012 Gracilibacteraceae Lee et al. 2010 Heliobacteriaceae Asao and Madigan 2010 Lachnospiraceae Rainey 2010 Peptostreptococcaceae Ezaki 2010 Ruminococcaceae Rainey 2010 Syntrophomonadaceae Zhao et al. 1993 emend. Zhang et al. 2019 Eubacteriineae Breed et al. 1944 (Approved Lists 1980) Oscillospiraceae Peshkoff 1940 (Approved Lists 1980) emend. Tindall 2019 Incertae sedis 723 Hitch et al. 2021 Thermincola Sokolova et al. 2005 Pelotomaculum Imachi et al. 2002 emend. Qiu et al. 2006 Desulfonispora Denger et al. 1999 Desulfotomaculum Campbell and Postgate 1965 emend. Campbell 1974 (Approved Lists 1980) Syntrophobotulus Friedrich et al. 1996 Peptococcus Kluyver and van Niel 1936 (Approved Lists 1980) emend. 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